“Kill n-----s“ was found written on an information stanchion at the African Burial Ground monument on Broadway near Reade St. at about 9:30 p.m. Thursday, cops said.

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The sick graffiti is believed to have been written between 11:30 a.m. and noon that day, authorities said.

Workers quickly erased the hateful words as cops began looking for surveillance video.

“Racism and white supremacy are not welcome in New York City. Period,” Mayor de Blasio tweeted Saturday evening. “Please contact the NYPD immediately if you have any information on this despicable crime.”

The monument marks the spot where an estimated 15,000 enslaved and freed Africans were buried between 1690 and 1794. At the time, Africans weren’t allowed to be laid to rest in traditional cemeteries.